<template>
  <div>
    <el-popover
      style="overflow-y: auto; "
      placement="bottom"
      trigger="click">
      <el-input
        style="margin-bottom: 10px"
        v-model="搜索内容"
        clearable
        @clear="searchHandleIptClear"
      >
        <el-button slot="append" icon="el-icon-search" @click="search" size="small" >搜索</el-button>
      </el-input>
<!--      树结构-->
      <el-tree
        style="width:auto"
        ref="tree"
        :props="props"
        :data="data"
        :check-strictly="false"
        @check-change="handleCheckChange"
        show-checkbox
        node-key="id"
        :default-expanded-keys="需要展开的节点keys"
        :default-checked-keys="[]"
        @node-click="handleNodeClick"
      >
        <span class="custom-tree-node" slot-scope="{ node, data }">
<!--          高亮的部分-->
          <span v-if="需要高亮节点数组.indexOf(data.id) !== -1" style="background-color: yellow">{{ node.label }}</span>
<!--          不需要高亮的部分-->
          <span v-else>{{ node.label }}</span>
        </span>
      </el-tree>
<!--      输入框 用来显示选中的节点内容-->
      <el-input slot="reference"
                style="width:380px"
                v-model="value.label"
                placeholder="节点"
                clearable
                readonly
                @clear="handleIptClear">
      </el-input>
    </el-popover>
  </div>
</template>
<script>
export default {
  data() {
    return {
      data: [{
        id: 1,
        label: '一级 1 A',
        children: [{
          id: 4,
          label: '二级 1-1 张三B',
          children: [{
            id: 9,
            label: '三级 1-1-1 李四C'
          }, {
            id: 10,
            label: '三级 1-1-2 王五a'
          }]
        }]
      }, {
        id: 2,
        label: '一级 2 赵六c',
        children: [{
          id: 5,
          label: '二级 2-1 张三b'
        }, {
          id: 6,
          label: '二级 2-2 李四a'
        }]
      }, {
        id: 3,
        label: '一级 3 王五D',
        children: [{
          id: 7,
          label: '二级 3-1 赵六d'
        }, {
          id: 8,
          label: '二级 3-2 钱七a'
        }]
      }],
      props: {
        label: 'label',
        children: 'children'
      },
      count: 1,
      value:{id:'', label: ''},
      需要高亮节点数组:[],
      需要展开的节点keys:[],
      搜索内容:''
    };
  },
  methods: {
    searchHandleIptClear(){
      this.需要高亮节点数组 = []
    },
    高亮模糊查询的节点递归(arr, 父节点){
      if(!arr || arr.length <= 0){
        return
      }
      let that = this
      arr.forEach(item=>{
        //不区分大小写匹配
        if(item.label.toUpperCase().indexOf(that.searchContent.toUpperCase()) !== -1){
          console.log('搜索内容匹配', that.searchContent, item, 父节点)
          that.需要高亮节点数组.push(item.id);
          if(父节点){
            that.需要展开的节点keys.push(父节点.id)
          }
        }
        if(item.children){
          that.高亮模糊查询的节点递归(item.children, item)
        }
      })
    },
    /**
     * 点击搜索
     */
    search(){
      let that = this
      //1 过滤所有内容
      that.需要高亮节点数组 = []
      that.需要展开的节点keys = []
      if(that.searchContent){
        this.高亮模糊查询的节点递归(this.data, null)
      }
      //3 展开匹配到的节点内容
    },
    // 清空输入框内容
    handleIptClear(){
      console.log('清空输入框内容')
      //清空选中内容
      this.$refs.tree.setCheckedNodes([])
      this.value.id = ''
      this.value.label = ''
    },
    /**
     * 更新被选中的值
     */
    updateCheck(){
      const seltedNodes = this.$refs.tree.getCheckedNodes()
      console.log(seltedNodes)
      const ids = seltedNodes.map(n => n.id)
      const labels = seltedNodes.map(n => n.label)
      this.value.id = ids + ''
      this.value.label = labels + ''
    },
    // checkbox被选中或取消选中
    handleCheckChange(arg1, arg2, arg3){
      console.log(arg1, arg2, arg3);
      this.updateCheck()
    },
    // 节点被点击
    handleNodeClick(arg1, arg2, arg3){
      console.log('nodes:', arg1, arg2, arg3)
      this.updateCheck()
    },
  }
};
</script>
